And with her little man’s 5th birthday right around the corner, Kerr is already starting to figure out how they’re going to celebrate his special day.

“Definitely a party — lots of balloons, his friends. I’m trying to [think] what would the theme be,” Kerr shares. “He’s really into train sets at the moment. He’s got a wooden train set. I’m thinking what I could do with the train set.”

Miranda Kerr‘s healthy lifestyle is definitely rubbing off on 3-year-old son, Flynn. And he has quite the impressive vocabulary to prove it.

“The other day he was like, ‘Mama, I want to make a smoothie.’ He wanted to make his own smoothie, and then he said, ‘This one’s for you. It’s full of antioxidants,'” the model mom told PEOPLE at a Reebok event in N.Y.C.

“He’s three years old, how does he know that? He obviously heard me talking.”

Kerr’s little boy has also become a big part of her fitness routine. “We dance all the time, he loves it. It’s one of his favorite things.”Read More